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An FPE breaker that actually TRIPPED? Amazing....

i see a red and a yellow wire to the ground buss and a yellow wire to the neutral buss. what is that to? doesnt look code compliant to me unless im wrong and it is ok for RV application or some such thing . also was this an origonal equip. item or an after purchase addition?

I'm sure the red wire on the ground bus isn't compliant. I don't have a clue why but they used a piece of 12-3 for the water heater in place of the 12-2w/g for everything else. The two yellow wires feed a little neon on the outside beside the shore power cable box. The intent was a polarity warning. If you connected shore power and the light came on, you had a miswired source.
The unit was being fed from a 20 amp 120 circuit with an adapter. The FPE breaker tripped the first time I plugged in the juice. I reset it and it stayed reset. The GE protecting the outlet went first from then on. I believe the whole thing is OEM. I may have been the first one to ever take the cover off the box (after I removed the wood around it). I was also a little curious why there are a couple of circuits run thru separate KOs and all the rest are run thru a big nipple. From what I saw, whoever approved this system was pretty optimistic about romex and "dry" locations.

British motorhome wiring is also frequently hidden away in inaccessible corners, making additions and tests very awkward sometimes.

A neon wired neutral-to-ground is also a common feature here to indicate reversed polarity on supplies, although without the complication of a 4-wire 120/240V hookup of course.

A panel face up??? This can't be a good idea! I feel bad for anyone who might spill their "Super Big Gulp" while sitting over that thing!

I'd be more worried about access in an emergency. It is under a 6" foam seat and under a 5/8" plywood (about 2 1/2 x 6 1/2 feet) bed extending piece then under the smaller wood cover you see in the picture.

One time I had a used pickup camper that I had just purchased. When checking out the camper in my driveway, my son got a shock from the shell. I immediately disconnected the shore power and checked it out.

In the little load center, the neutral was bonded to the panel-like you would do on a service entrance. It appeared to have come from the factory that way.

The power inlet was wired backwards, the end result being the entire camper shell was hot and must have been that way from the day it left the factory floor.

When dealing with any kind of RV, there is but one safe assumption: assume it is totally screwed up and work from there. I am sure they see no form of outside inspection when they are built in a factory.
I volunteered in a summer camp one year. A staff member reported that she smelled gas in the RV she was living in. I went in and started looking. EVERY gas connection I could find was loose! This was a nice unit from a well known company. It really took me a couple of hours to settle my nerves after I finished defusing that bomb.